Google Docs are incompatible with complex formatting (LibreOffice and even Office365 are too). Moreover, even the Word itself is kinda incompatible with complex

Google Docs are incompatible with complex formatting (LibreOffice and even Office365 are too). Moreover, even the Word itself is kinda incompatible with complex formatting: sooner or later one of your collaborators will copy/paste some text with a formatting you will be just unable to change/clear. Anyway, Word «collaborative» features are so much worse than git repository and pull requests! And even you need to collaborate with some extremely non-technical folks, in the case of LaTeX they still use add comments to the PDF file — and this workflow is still way more productive than editing the same Word document. Other reasons to not to use Word in collaborative pipelines are already mentioned in neighbor threads.